Laser scanners are devices that use laser beams to measure distances and create detailed 3D models of objects or environments. They work by emitting a laser pulse and measuring the time it takes for the pulse to bounce back after hitting a surface. This information is then used to calculate the precise location of points in space, allowing for accurate mapping and modeling. These scanners are widely used in various fields, including architecture, engineering, and archaeology. They can capture complex shapes and structures quickly, making them valuable tools for creating digital representations of real-world objects.